Starting off at the square, I follow the story path. The purple gates opened first. So I'm heading there and go to the right side gate. There is the first chest standing in the open.
All done in those side areas, go through the big gate and up the stairs. There is a pipe to the left. Take it and do the Red Ring Challenge. Get all 8 Red Coins.
Next, also up the pipe, you need to MOVE! the boxes. But imagine there being a mirror in the middle. Mirror the boxes to the Stone Blocks on the other side.
Follow the story path, pass the first battle ground and you'll see a blue pedestal. Go through the pipe to get the statue, put it on the pedestal and take the cannon to get to the chest.
Back at Spooky Square with the Grammophone Pedestal in your back, go to the right (the second gate you opened in the story). Take the left side path and pick up the chest on the graveyard.
No go take the other side path, MOVE! away the block from in front of the pipe. There is a closed cannon on the other side. To unlock it, take the other pipe from the area, where you pushed the block away and push the red button. This unlocks the cannon. Take the cannon. It will shoot you to the yellow blocked door area on the other side.
You end up at the first side path again. Go back to the second one. Either by pipe or open the yellow door. Then go up the stairs. The chest is in the far left corner.
After the Toadette Chest (Next to Challenge 4) go down the path behind the chest. Behind the big spiked bomb you can SMASH! some stones and go through the pipe.
Take the cannon back. But it will shoot you quite a bit ahead. Go back the way. Just before you get to Challenge 4 (Where Toadette dropped the chest) there is a Blue Cannon Challenge to take.
Continue the path, pass the coloured floor puzzle, the battleground, until you get to the block moving laser beam puzzle. There is a block to SMASH! In front of a pipe.
In the same area, you can take a pipe where you can SMASH! a lot of blocks. Do so until you find the blue button to push. Then take the pipe that just opened.
Continue the story path by going through the big gate. When you get to the pipe, go up, MOVE! the block down onto the button and go down the pipe again to get the chest.
Now go back to the Spooky Square, placing the Ghost on the pedestral, the Plant Gate opens. Take the side gate to the left. Go down. At the right, there is an alley with a statue. Put it on the Red Pedestal.